$.ajax({
        type : "get",
        dataType : 'jsonp',
        url: url,
        jsonpCallback: "callback",     
        data: {
            catid: n_catid,
            id: '28,38'
        },
        success: function(data) {
            if ( data.status) {
                                                                  
                    }
                          
                });

public function actionGet() {
          
       $json = $model->getListDataById($id, $catid); 
          
       die('callback'.'('.json_encode($json).')');
    }